支持laravel8

composer.json

@@ -14,7 +14,7 @@
     "require": {
         "php": ">=7.1.0",
         "symfony/dom-crawler": "~3.1|~4.0|~5.0",
-        "laravel/framework": "~5.5|~6.0|~7.0",
+        "laravel/framework": "~5.5|~6.0|~7.0|~8.0",
         "doctrine/dbal": "2.*",
         "spatie/eloquent-sortable": "3.*"
     },